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A one tailed test is when you are testing specifically for an increase or decrease- eg whether the probability of a person buying a product has INCREASED after a marketing change

A two tailed test ...

At GCSE osmosis was simplified to just diffusion of water so it is the spreading out of water molecules from where there is a high concentration to a low concentration- but in fact osmosis depends both on...

To replicate the DNA of a eukaryotic cell, the double helix structure must first be unwound to present the base pair sequence. This is done using DNA helicase (this enzyme breaks the hydrogen bonds connec...

When starting learning Portuguese, some may wonder whether they need to opt for European (Portuguese as spoken in Portugal) or Brazilian Portuguese. The differences lie mainly in pronunciation, although t...

1. mRNA is only single stranded, whereas DNA is a double stranded molecule 2. mRNA has Uracil instead of thymine which is found in DNA 3. mRNA contains no introns as they have been spliced out, however...